/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.dubbo.rpc;

/**
 * TODO this is just a workaround for rest protocol, and now we just ensure it works in the most common dubbo usages
 *
 */
public class ServiceClassHolder {

    private static final ServiceClassHolder INSTANCE = new ServiceClassHolder();

    private final ThreadLocal<Class> holder  = new ThreadLocal<Class>();

    public static ServiceClassHolder getInstance() {
        return INSTANCE;
    }

    private ServiceClassHolder() {
    }

    public Class popServiceClass() {
        Class clazz = holder.get();
        // 防止内存泄露(线程池情况下)，所以主动调用remove
        holder.remove();
        return clazz;
    }

    public void pushServiceClass(Class clazz) {
        holder.set(clazz);
    }
}
